Combining Galileo’s HAS and the E5 AltBOC signal for terrestrial mobile mapping

Abstract. We discuss the precision and multipath robustness properties of the Galileo E5 AltBOC signal, the Galileo High Accuracy Service (HAS) for Galileo and GPS, and the potential advantages of combining HAS with the E5 AltBOC ranging signals in view of the current HAS corrections being limited to the E1, E5a and E5b signals. For this purpose we analyse the behaviour of HAS for static positioning in ideal conditions and by just using pseudo-range measurements. We do this for the conventional E1/E5a HAS combination and for the E1/E5 AltBOC one using a simple rough approximation of the future E5 AltBOC HAS corrections (HAS pseudo-corrections for E5 AltBOC). This provides initial insight and shows how the E5 AltBOC measurements benefit from the pseudo-corrections. We then proceed analogously with kinematic measurements in a urban environment. We conclude by recommending that HAS be extended to provide corrections for the E5 AltBOC signals.